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Brain–Computer Interfaces
arXiv (BCI) · June 17, 2026

SwitchBraidNet: Quantisation-Aware Lightweight Architecture for Hybrid Brain-Computer Interface

Gourav Siddhad, Yogesh Kumar Meena

Hybrid BCIs combine two kinds of signal: motor imagery, where someone imagines moving, and steady-state visual evoked potentials, the rhythmic response to a flickering stimulus. Together they carry more information than either alone, and together they cost more to decode than embedded hardware can afford.

That gap decides what gets built. A decoder needing a workstation confines the interface to a lab bench, and the applications people actually want are wearable and battery-powered.

SwitchBraidNet targets the constraint directly, and the quantisation-aware part of the name matters. A model shrunk after training often loses accuracy in ways nobody anticipated; one trained knowing it will run in reduced precision can adapt to that during learning. The dual-path temporal braid reflects the same pragmatism, since the two signal types live at different timescales and forcing them through one pathway wastes capacity reconciling them.

From the arXiv (BCI) abstract

Hybrid brain-computer interfaces (BCIs) that integrate motor imagery (MI) and steady-state visual evoked potentials (SSVEP) provide high-dimensional neural decoding but typically exceed the computational limits of embedded hardware. To address this, we propose SwitchBraidNet, a compact EEG classification architecture designed for low-power deployment. The model employs a dual-path temporal braid to extract multiscale oscillatory features, an adaptive squeeze-and-excitation…


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